araujo 77342f68c6 vq_getchain() can return -1 if some descriptor(s) are invalid and prints
a diagnostic message. So we do a sanity checking on the return value
of vq_getchain().

Spotted by:	gcc49
Reviewed by:	avg
MFC after:	4 weeks
Sponsored by:	iXsystems Inc.
Differential Revision:	https://reviews.freebsd.org/D15388
2018-05-15 05:55:29 +00:00
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